In-depth guide · CampingSpirit
From the rapids at Great Falls via Frederick, the Catoctin Mountains, Antietam and Harpers Ferry to the end of the C&O Canal in Cumberland: some 520 kilometres of river valley, Civil War history and Appalachian ridges in Maryland’s narrow west.
The spirit of the route
Here the Potomac is not yet a capital-city river but a mountain river with rock ledges, islands and brown floodwater after every thunderstorm. Alongside it, for almost 300 kilometres, runs the towpath of the old Chesapeake & Ohio Canal, with lockkeepers’ houses, masonry aqueducts and turtles on logs in the still canal water. The route follows this line upstream: from the roar at Great Falls to the brick town of Frederick, over the wooded crest of South Mountain to the quiet fields of Antietam, where on a single September day in 1862 more Americans were killed or wounded than on any other day in the country’s history. Beyond that, Maryland becomes so narrow that at Hancock you can almost look across both borders. From the sliding door you see mist over the river in the morning, deer at the edge of the Green Ridge forest in the evening, and in Cumberland a steam locomotive whistles before it works its way up the mountain.
Stage-by-stage plan
1Stage 1: Washington, D.C. to Clarksburg (Little Bennett) (approx. 75 km)
- The drive
- Washington is only the starting point: if you pick up a motorhome there, it is best to leave the city outside rush hour via the Capital Beltway (I-495) heading north. River Road (MD-190), Falls Road (MD-189) and MacArthur Boulevard take you to Great Falls on the Maryland side; the roads are two-lane, winding and narrow near built-up areas. Then take I-270 north to Clarksburg. Driving time around 1.5 hours, considerably more in commuter traffic. Plenty of filling stations and supermarkets in Rockville and Gaithersburg.
- Highlights & must-sees
- Great Falls (C&O Canal National Historical Park): from the Great Falls Tavern Visitor Center the path leads over boardwalks and bridges on Olmsted Island to the overlook above the rapids, where the Potomac drops around 20 metres through a rocky gorge. Check entrance fees, including any surcharges for visitors not resident in the US, in advance on nps.gov.
- Billy Goat Trail, Section A: a scramble over rock slabs along Mather Gorge, using hands and feet; not for dogs and not in wet conditions; very busy at weekends. If you prefer it quieter, walk the flat towpath past the locks.
- Towpath and locks at Great Falls: here you see the canal with water, masonry lock chambers and the tavern building of 1828 – a foretaste of the end point in Cumberland.
- CampingSpirit overnight tip
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Official campsite or RV park: Little Bennett Campground (Montgomery Parks) near Clarksburg: woodland campground in Little Bennett Regional Park near I-270, sites with and without electricity, shower block, dump station. Reservations through Montgomery Parks; check season and lengths when booking. For a start close to the city: Greenbelt Park (NPS) in Greenbelt, Maryland, with around 170 sites without hookups and a Metro connection to downtown, reservations through recreation.gov.
Free camping or nature tip (where legal): In Washington, D.C. and the surrounding area, sleeping in your vehicle on streets and in car parks is not permitted; the car parks at Great Falls close in the evening. There is no legal free-camping option in the metropolitan area.
- Insider tip for campers
- On sunny weekends the car parks at Great Falls are full by mid-morning; with a large vehicle, come on a weekday and early. Do not drive a motorhome in Washington itself: parking is next to impossible, and some bridges and parkways have restrictions. Better to visit the city by Metro from the campground.
2Stage 2: Clarksburg to Thurmont (Catoctin Mountain) (approx. 70 km)
- The drive
- Take I-270 and MD-355 to Frederick, then US-15 north through orchard country to Thurmont, where MD-77 climbs into the Catoctin Mountains. US-15 is a fast four-lane road; MD-77 in the park is winding with gradients but easily drivable in a motorhome. Driving time around 1 hour. Just before Frederick, Monocacy National Battlefield lies directly on the route. Shopping and fuel in Frederick and Thurmont.
- Highlights & must-sees
- Frederick: old town with church spires (“Clustered Spires”), brick houses and Carroll Creek Linear Park, a canal park in the middle of town. Park motorhomes outside the centre; the parking garages have height limits.
- National Museum of Civil War Medicine on East Patrick Street: shows soberly how the wounded were cared for after the battles of 1862 – field hospitals, amputations, ambulance trains. At the time the whole town was one big hospital; the museum is good preparation for Antietam.
- Monocacy National Battlefield: here in July 1864 Union troops held up a Confederate advance on Washington for a day. A short driving tour with walking trails past farms and the river, quiet and usually little visited.
- CampingSpirit overnight tip
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Official campsite or RV park: Cunningham Falls State Park, William Houck Area: campground above Hunting Creek Lake with sites with and without electricity, bathhouses and dump station; a second area (Manor Area) lies on US-15 near the Catoctin Furnace. Reservations through the Maryland Park Service online system. In the adjoining Catoctin Mountain Park (NPS) is Owens Creek Campground with basic sites without hookups, open seasonally, reservations through recreation.gov; note the vehicle length limits there.
Free camping or nature tip (where legal): In Catoctin Mountain Park and Cunningham Falls, overnight stays are permitted only at the campgrounds. The northern part of the Catoctin area is partly closed because of Camp David, the president’s country retreat; do not drive on closed roads or tracks.
- Insider tip for campers
- The Lower Trail to Cunningham Falls, Maryland’s largest cascading waterfall, is short and partly on boardwalk; on summer weekends the car parks at the lake and on MD-77 fill up early. Some heavily visited state parks on the route, including Greenbrier and Rocky Gap, require a day-use reservation for entry on summer weekends and holidays (for campers the site booking counts); Cunningham Falls is not one of them so far – check the park’s page in advance. In Catoctin Mountain Park the viewpoint rocks Chimney Rock and Wolf Rock are worth it.
3Stage 3: Thurmont to Boonsboro (Greenbrier) (approx. 85 km)
- The drive
- Take MD-77 and MD-17 south through the Middletown Valley, then Alternate US-40, the old National Road, over the crest of South Mountain at Turner’s Gap. The access road to Washington Monument State Park is a narrow, steep mountain road. Continue via Boonsboro and MD-34 to Sharpsburg. Winding country roads, 40–50 mph, driving time around 2 hours. Fuel in Middletown and Boonsboro.
- Highlights & must-sees
- Washington Monument State Park: a squat stone tower of 1827, the first completed monument to George Washington, stands on the crest of South Mountain right on the Appalachian Trail. From the tower you look across the Cumberland Valley to Pennsylvania; in autumn the ridge is a migration route for birds of prey.
- South Mountain: three days before Antietam, fighting took place at Turner’s, Fox’s and Crampton’s Gaps. At Crampton’s Gap, in Gathland State Park, a stone arch commemorates the war correspondents of the Civil War.
- Antietam National Battlefield near Sharpsburg: on 17 September 1862 around 23,000 soldiers were killed, wounded or reported missing. The driving tour leads to Dunker Church, Bloody Lane and Burnside Bridge; afterwards the National Cemetery in Sharpsburg. The renovated visitor centre shows a film and an exhibition on the battle; check fees on nps.gov.
- CampingSpirit overnight tip
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Official campsite or RV park: Greenbrier State Park near Boonsboro: campground on the edge of South Mountain with several loops, some with electricity, bathhouses and dump station; a swimming lake in the park. Reservations through the Maryland Park Service system. For tent campers and small vehicles: Antietam Creek Campsite on the C&O Canal below Sharpsburg, basic sites without hookups, reservations through recreation.gov; unsuitable for motorhomes.
Free camping or nature tip (where legal): Overnight stays are prohibited on the Antietam battlefield, at the South Mountain gaps and in the Appalachian Trail car parks. There is no public land for dispersed camping in the Washington County area.
- Insider tip for campers
- Antietam is an open-air cemetery: drive slowly, be quiet at the stops, do not climb on monuments. The tour road is drivable in a motorhome, though some pull-outs are short; at Burnside Bridge use the larger car park. The Pry House Field Hospital Museum on the edge of the battlefield, run by the Museum of Civil War Medicine, complements the visit in Frederick; check opening times in advance.
4Stage 4: Boonsboro to Fort Frederick State Park (approx. 130 km)
- The drive
- Via Sharpsburg and Harpers Ferry Road south along the Potomac, then US-340 across the river into West Virginia to the Harpers Ferry visitor centre. Then WV-230 to Shepherdstown, across the Potomac bridge back into Maryland, and via MD-34 and MD-65 to Hagerstown. From there take I-70 west to Big Pool (MD-56 exit). Country roads narrow and winding, I-70 from Hagerstown with heavy truck traffic. Driving time around 2.5 hours. Fuel and shopping mainly in Hagerstown.
- Highlights & must-sees
- Harpers Ferry National Historical Park (West Virginia): the old town lies at the confluence of the Shenandoah and the Potomac. Park at the visitor centre on US-340, from where shuttle buses run to Lower Town; there is practically no parking for motorhomes there. Sights include John Brown’s Fort, The Point overlook and Jefferson Rock; if you are fit, climb Maryland Heights. Check fees and surcharges for visitors not resident in the US on nps.gov.
- Shepherdstown (West Virginia): a short stop in one of the oldest towns in the state, with a university street, cafés and the Rumsey Monument above the river, which commemorates an early steamboat of 1787. Parking for large vehicles on the edge of town.
- Hagerstown: supply stop at the junction of I-70 and I-81, with large supermarkets, DIY stores and propane; if you have time, visit City Park with the Washington County Museum of Fine Arts.
- CampingSpirit overnight tip
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Official campsite or RV park: Fort Frederick State Park near Big Pool: campground on the Potomac below the fort, basic sites without electricity, without showers and without a dump station; check water supply when booking; reservations through the Maryland Park Service system. Alternative a little further upstream: McCoys Ferry Campground on the C&O Canal (NPS), basic sites for smaller vehicles, reservations through recreation.gov. If you want to stay in West Virginia, there are only private campgrounds near Harpers Ferry.
Free camping or nature tip (where legal): In Harpers Ferry, Shepherdstown and Hagerstown, sleeping in your vehicle on streets and in car parks is not provided for; the visitor centre car park closes in the evening. The hiker-biker sites on the C&O Canal are only for hikers and cyclists, not for vehicles.
- Insider tip for campers
- Arrive early in Harpers Ferry: the visitor centre car park fills up by around midday, and on autumn weekends so do the overflow areas. Lower Town lies in the flood zone and has been flooded several times; after heavy rain it may be partly closed. If you want to see the towpath: the footbridge alongside the railway bridge takes you from Lower Town straight to the Maryland side.
5Stage 5: Fort Frederick State Park to Rocky Gap State Park (approx. 95 km)
- The drive
- Take I-70 to Hancock, where Maryland is only a few kilometres wide; then I-68 west. Immediately beyond Hancock the motorway cuts through Sideling Hill, followed by Town Hill, Green Ridge and Polish Mountain with long climbs and descents. For Green Ridge, leave at the M.V. Smith Road exit and take gravel roads into the forest, then back on I-68 to the Rocky Gap exit. If you prefer a slower pace, take the parallel Scenic US-40 over Town Hill for some stretches. Driving time around 2 hours. Fuel in Hancock; no supplies in the forest.
- Highlights & must-sees
- Fort Frederick: stone fort of 1756 from the French and Indian War, reconstructed barracks and, at weekends, interpreters in period dress. From the park the paved Western Maryland Rail Trail runs to Hancock, parallel to the towpath.
- Sideling Hill Road Cut: the I-68 cutting exposes a folded rock syncline from the Palaeozoic, visible over a height of around 100 metres. The former exhibit centre now serves as a welcome centre with a rest area, accessible from both directions; a footbridge over I-68 links the two sides and offers the view of the cutting. Stop only there, never on the hard shoulder in the cutting itself.
- Green Ridge State Forest: Maryland’s largest contiguous forest, with forest roads and viewpoints over the Potomac bends. On its southern edge is the canal’s Paw Paw Tunnel (over 900 metres long, on foot with a torch; car park on MD-51 near Paw Paw, West Virginia). With the rock stabilisation work completed, the tunnel and towpath are open again; cyclists push their bikes in the tunnel and on the boardwalks.
- CampingSpirit overnight tip
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Official campsite or RV park: Rocky Gap State Park near Flintstone: large campground on Lake Habeeb with sites with and without electricity, bathhouses with showers, dump station and swimming beach; right on I-68. Reservations through the Maryland Park Service system; in autumn book early because of the fall foliage.
Free camping or nature tip (where legal): In Green Ridge State Forest, camping is permitted at designated basic sites along the forest roads – without water or electricity, for a fee and with registration at the headquarters on I-68. Outside these sites, overnight stays are prohibited. The gravel roads are fine for small campers, only partly suitable for large motorhomes and trailer rigs; ask locally about suitable sites.
- Insider tip for campers
- The I-68 gradients between Hancock and Cumberland are long: on the way down use a low gear and take the truck warning signs seriously; on the way up keep to the right lane. Black bears live in Green Ridge – keep food and rubbish locked in the vehicle. In autumn the area is hunting ground: wear bright, conspicuous clothing on forest trails and note the Maryland DNR hunting dates.
6Stage 6: Rocky Gap State Park to Cumberland and onward to Garrett County (approx. 45 km)
- The drive
- Take I-68 to Cumberland, where the town lies squeezed between Wills Mountain and the Potomac; the motorway runs right through the town with tight bends and a descent, with a much lower speed limit there. In the evening back to Rocky Gap. If you want to continue west, take I-68 over the heights at Frostburg to Garrett County: Deep Creek Lake is around 1 hour away, with some long climbs. Fuel and shopping in Cumberland and LaVale.
- Highlights & must-sees
- Cumberland, end point of the C&O Canal: at Canal Place the visitor centre in the old Western Maryland Railway station recalls the canal era; here the towpath ends after 184.5 miles, and the Great Allegheny Passage begins its 150 miles to Pittsburgh. Riding a few kilometres in either direction by bike is worthwhile.
- Western Maryland Scenic Railroad: excursion trains from the station in Cumberland through the Narrows, over the Horseshoe Curve and through a tunnel to Frostburg; on selected days steam locomotive No. 1309 pulls the train. Check the timetable and type of train in advance; the autumn trips book up early.
- Onward to Deep Creek Lake and Swallow Falls State Park: in the Garrett County highlands lie Maryland’s largest lake and, with Muddy Creek Falls, a high waterfall in hemlock forest. Here the landscape joins that of the Laurel Highlands, which the CampingSpirit guide to the Laurel Highlands in Pennsylvania describes in detail.
- CampingSpirit overnight tip
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Official campsite or RV park: Second night at Rocky Gap State Park. For continuing west: Deep Creek Lake State Park with a lakeshore campground, sites with and without electricity, bathhouses; also through the Maryland Park Service system. Smaller vehicles will find Spring Gap Campground (NPS) on the canal near Cumberland, with basic sites by the river.
Free camping or nature tip (where legal): In Cumberland, overnight stays on streets and in car parks are not permitted. In Savage River State Forest and Potomac-Garrett State Forest to the west there are, as in Green Ridge, basic designated sites with registration; otherwise no free camping.
- Insider tip for campers
- At Canal Place there are parking areas with room for larger vehicles too; park there during the day and link the station, canal basin and old town on foot. If you take the train to Frostburg and want to cycle back, take your bike along and roll mostly downhill on the Great Allegheny Passage to Cumberland – check bike carriage and spaces in advance. Before continuing to Garrett County, fill up with fuel and water in Cumberland.
Camping practice & local rules
Wild camping & overnight parking
- Maryland permits overnight stays only at campgrounds. The exception is the state forests in the west (Green Ridge, Savage River, Potomac-Garrett): there are basic designated sites with registration and a fee; free camping away from them is prohibited. In West Virginia, Harpers Ferry and Shepherdstown are municipal or federal land respectively, with no dispersed camping.
- The hiker-biker sites on the C&O Canal are free but exclusively for hikers, cyclists and paddlers; the only ones reachable by vehicle are the few NPS drive-in campgrounds (including McCoys Ferry, Fifteenmile Creek, Spring Gap) with short pitches.
- Rest areas on I-70 and I-68 are for taking a break; observe the posted maximum parking time. Supermarket car parks only with the store’s express permission.
- Reservations: Maryland state parks through the Maryland Park Service online system; NPS sites (Greenbelt, Owens Creek, drive-in sites on the canal) through recreation.gov. In some heavily visited state parks (on this route Greenbrier, Rocky Gap and Swallow Falls) there are day-use entry reservations at weekends and on holidays from Memorial Day to Labor Day, bookable through parkdayuse.maryland.gov.
- Federal sites: Great Falls, Antietam and Harpers Ferry charge entrance fees; the America the Beautiful Pass is valid. Check entrance fees, including any surcharges for visitors not resident in the US, in advance on nps.gov.
- Apps: iOverlander, Campendium, The Dyrt and Recreation.gov; Park4Night is not widely used here.
Waste disposal & supplies
- Dump stations: at the larger state park campgrounds (Cunningham Falls, Greenbrier, Rocky Gap, Deep Creek Lake) and at Little Bennett; the basic sites on the canal, at Fort Frederick and in the state forests have none. Check the facilities of each loop when booking.
- Drinking water at the campground taps; at NPS sites on the canal, pumps are sometimes only in operation seasonally or out of service because of water testing. Fill up before Green Ridge.
- Empty grey water and chemical toilets only at dump stations, never into the canal or river.
- Propane: DIY stores, filling stations and campgrounds fill US cylinders, particularly easily in Frederick, Hagerstown and Cumberland; European cylinders are generally not filled.
- Electricity: state park sites mostly 30 A, some 50 A; NPS sites without electricity, generators only at set times.
- Shopping and fuel: Rockville, Frederick, Thurmont, Boonsboro, Hagerstown, Hancock and Cumberland; between Hancock and Cumberland hardly any supplies away from the motorway exits.
Vehicle size & traffic rules
- Speed limits: interstates in Maryland 55–70 mph, mostly 55 mph in the Washington metropolitan area; country roads mostly 50–55 mph. In West Virginia, 55 mph is usually permitted on country roads. Mobile phones at the wheel hands-free only in both states.
- I-68 between Hancock and Cumberland: several long climbs and descents over Sideling Hill, Town Hill and Polish Mountain, tight bends with reduced speed in Cumberland. Use engine braking, do not overheat the brakes, and expect fog and, in winter, ice on the heights.
- Tolls: there are no regular toll roads on the route; express lanes in the Washington area and in Virginia only with a transponder. With rental vehicles, clarify the toll arrangements in advance.
- Wildlife: Maryland and especially West Virginia have very many deer collisions, above all at dusk and during the rut from October to December. Drive more slowly at night and watch for eyes at the roadside; black bears also cross the roads in the west.
- Ticks: Lyme disease is widespread in Maryland and West Virginia; besides the deer tick, the lone star tick also occurs. Check yourself after hikes, tuck long trousers into your socks.
- Flooding on the Potomac: after heavy rain or snowmelt the river rises quickly; the towpath, riverside roads, canal campgrounds and Lower Town in Harpers Ferry may be closed. Check river levels and National Weather Service warnings, and never drive through flooded roads. Emergency: 911; mobile reception patchy in Green Ridge and in the river valley.
- Onward travel: Skyline Drive and Shenandoah are covered in the CampingSpirit guide to Skyline Drive and the Blue Ridge Parkway, Gettysburg and South Mountain in Pennsylvania in the guide to Pennsylvania Dutch Country and Gettysburg.
CampingSpirit packing & preparation checklist
- Tick tweezers, tick repellent and long, light-coloured clothing: the woods and meadows along the entire route are tick territory.
- Bike with a puncture kit and wide tyres: the towpath and the Great Allegheny Passage are the best way to experience the canal and river; the path is unpaved and muddy after rain.
- Head torch or powerful torch: for the unlit Paw Paw Tunnel and the dark forest roads in Green Ridge.
- Bear-proof storage or a lockable box in the vehicle: black bears live in Green Ridge and Garrett County.
- Weather app with National Weather Service severe weather and flood warnings: summer thunderstorms make the Potomac rise quickly.
- Sturdy shoes with good tread and gloves: for the rocks on the Billy Goat Trail and the climbs to Maryland Heights and Chimney Rock.
As of 2026-10. Closures, fees and booking rules change: check official sources before you go.
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